Samsung Galaxy S3 mini — Need Help to add changes in Settings.apk

Hi all,

I am new to android. I need to add some changes in settings.apk application and test it in samsung galaxy III phone. I dont want to re - install the android os since it may spoil my phone. Is it possible to replicate the settings.apk to settings_test.apk etc and compile and run as separate application ?

If yes, Kindly help me with the changes/steps that i need to work on ?

In particular, my requirement is to change the wifi related stuff alone in settings.apk ... It would be great if i am guided to run the WiFi settings as separate android application..

Thanks in advance!